Gaul, W., & Schader, M. (1986). Classification as a tool of research: Proceedings of the 9th Annual Meeting of the Classification Society, University of Karlsruke, F.R.G., 26-28, 1985. North-Holland.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিGaul, W., এবং M. Schader. Classification as a Tool of Research: Proceedings of the 9th Annual Meeting of the Classification Society, University of Karlsruke, F.R.G., 26-28, 1985. Amsterdam: North-Holland, 1986.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিGaul, W., এবং M. Schader. Classification as a Tool of Research: Proceedings of the 9th Annual Meeting of the Classification Society, University of Karlsruke, F.R.G., 26-28, 1985. North-Holland, 1986.
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